Pilots flying the IndiGo's Chennai-Kuwait flight declared emergency in the early hours of Friday and landed back at the Chennai airport soon after the departure due to a fire alarm, which later turned out to be false, said a source.

The A320neo plane had taken off around 1.20 am with more than 160 passengers.

Just 15 minutes after the departure, the pilots observed a fire alarm and immediately relayed the emergency code 7700 to all Air Traffic Controls, said a source privy to the development.

The fire alarm was later found to be because of faulty smoke detectors in cargo compartment, the source said.
01/11/19 PTI/India Today